The triquetra has been found on runestones in Northern Europe and on early Germanic coins. It presumably had pagan religious meaning and it bears a resemblance to the Valknut, a symbol associated with Odin.
G Scale Trains are usually referred to as Garden Trains since they are the largest of the model trains and are used outdoors as well as indoors.
Model trains come in many different sizes, or scales. For those just getting started in the hobby, deciding on a scale for themselves or their children can be a big dilemma. The short answer is that there is no one single best scale of course, but there may be the best scale for you. Understanding Scale.